Scholarlink

<p>The shear mechanical behavior of the soil-rock mixtures (S-RMs) - bedrock interface plays a critical role in the stability of accumulation slopes. Through systematic large-scale direct shear tests, this study investigated the influence of gap-graded characteristics and bedrock surface morphology on the shear behavior of the interface, explored the underlying shear mechanisms and conducted the applicability analyses of different constitutive models.The results demonstrate that bedrock surface morphology is a key factor controlling the interface shear strength. An increase in relative roughness (<i>R</i><sub>n</sub>) significantly enhances shear strength; however, this relationship is nonlinear, with uniformly rough surfaces exhibiting more stable shear performance. The influence of S-RMs gradation reveals a critical relative roughness threshold (<i>R</i><sub>nc</sub>=0.5 ~ 0.6), beyond which the shear strength decreases with increasing <i>R</i><sub>n</sub>. With increasing <i>R</i><sub>n</sub>, the governing shear mechanism shifted progressively from S-RMs internal particle interlocking and frictional resistance to interlocking occurring between particles and bedrock protrusion. Regarding model applicability, the CPE model proved more suitable than the Duncan-Chang model for describing the nonlinear shear mechanical response of the interface. These findings provide useful guidance for the engineering design of accumulation slopes underlain by bedrock.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of discontinuous gradation and surface morphology on the shear behavior of soil rock mixtures-bedrock interface

  • 期刊论文

  • 发表日期：

    2026年8月1日

查看全文
  • Chao Zhang,
  • Yaomin Luo,
  • Binhui Ma,
  • Fan Jiang,
  • Dongping Zhu,
  • Aoqing Lou

摘要

The shear mechanical behavior of the soil-rock mixtures (S-RMs) - bedrock interface plays a critical role in the stability of accumulation slopes. Through systematic large-scale direct shear tests, this study investigated the influence of gap-graded characteristics and bedrock surface morphology on the shear behavior of the interface, explored the underlying shear mechanisms and conducted the applicability analyses of different constitutive models.The results demonstrate that bedrock surface morphology is a key factor controlling the interface shear strength. An increase in relative roughness (Rn) significantly enhances shear strength; however, this relationship is nonlinear, with uniformly rough surfaces exhibiting more stable shear performance. The influence of S-RMs gradation reveals a critical relative roughness threshold (Rnc=0.5 ~ 0.6), beyond which the shear strength decreases with increasing Rn. With increasing Rn, the governing shear mechanism shifted progressively from S-RMs internal particle interlocking and frictional resistance to interlocking occurring between particles and bedrock protrusion. Regarding model applicability, the CPE model proved more suitable than the Duncan-Chang model for describing the nonlinear shear mechanical response of the interface. These findings provide useful guidance for the engineering design of accumulation slopes underlain by bedrock.